— 18 — 



feeding- and watering place for all. Under 

 such conditions, the nasal excretions, 

 sputa, mucus ejected when coughing, and 

 dejections, splash the food, the walls, 

 the troughs and beds, and so the viru- 

 lent matters pass into the digestive canal 

 of the animal near the diseased one. 



These circumstances explain the why 

 and the wherefore of the contamination 

 among stalled cattle, and prove that the 

 presence of one tuberculose animal may 

 be considered as a grave peril for the 

 whole number in the same shed. 



